Improvement in combined sand-pump and center-bit for oil-wells



UNITED STATES PATENT OFFICE.

ANDRUS CUNNINGHAM, OF PLEASANTVILLE, PENNSYLVANIA.

IMPROVEMENT IN COMBINED SAND-PUMP AND CENTER-BIT FOR OIL-WELLS.

Specification forming part of Letters Patent No. 211,709, dated January 28, 1879; application filed May 15, 1878.

To all whom it may concern:

Be it known that I, ANDRUS CUNNINGHAM, of Pleasantville, in the countyof Venango and State of Pennsylvania, have invented a -new and useful Improvement in Combined Sand- Pump and Center-Bit for Oil and Artesian Wells; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, forming a part of this specification, in which- Figure 1 represents a vertical section of my improved sand-pump with the bit attached, and showing the edge of said bit. Fig. 2 is an elevation of the same, showing the side of the bit. Fig. 3 is a side elevation with the lower part partly in section, showing the bowl substituted for the bit.

My invention relates to a combined sandpump and center-bit, whereby the different attachments can be made available according to the condition of the debris in an Artesian or oil well.

A represents a sand-pump, having a pin, A, for the introduction of a rope-socket for operating the same. It is also provided with the ordinary pump-valve A The upper end of said pump has a number of apertures, a a a, 860., for the egress of air and liquid. The lower end is provided with a screw-threaded sleeve, a, having securely screwed thereon a bit, B, or a bowl, 0. The bit 13 is provided with a straight cutting-edge, E, and also with an opening, D, for allowing the debris to enter the pump.

The bit B is used for stirring up the sediment, as a narrow bit can penetrate condensed sand or drillings much easier than an ordinary sand-pump.

When the debris in the well 1s in a semi- ]iquid condition the bowl is substituted for' the bit, and is operated in like manner.

In operating my pump for settled sand, I insert the bit B, screwing it'securely against the shoulder b. As the debris enters the pump the air or liquid in the pump is forced through the apertures a a a a, thus more effectually cleaning the well.

WVhen the debris in the well is more liquid than solid, I remove the bit and attach the bowl, which removes the debris like an ordinary sand-pump.

The straight-edged bit B or the bowl 0 is connected to the internally-threaded cylinder A by means of the internal sleeve, (0, to produce a smooth surface the whole length of the tool without requiring any forging or chamfering of the parts.

I claim A sand-pump formed of the combination of a pumpwylinder, A, having perforations a near its upper extremity, and an internal screw thread cut in its lower end, with a threaded sleeve, to, and a perforated bit, B, having a straight cutting-edge, E, interchanging with a bowl, 0, substantially as shown,

and for the purpose described. 7

In testimony whereof I, the said ANDRUs CUNNINGHAM, have hereunto. set my hand.

ANDRUS CUNNINGHAM.

Witnesses:

JAMES C. Boron, W. R. EDELEN. 

